Price Impact Calculator for Small Token Pools
How it works
The calculator uses the simplest model, a constant product pool, where the two sides of the pool multiply to a constant. A pool with total liquidity L has about L/2 on each side. A buy of size S adds S to the quote side, so the price ends up at (1 + S / (L/2)) squared times the old price. See liquidity depth and price impact and what a liquidity pool is.
What it does not include
- Real pools can differ from this simple model, and fees vary.
- It ignores network fees, other traders moving the price at the same moment, and any liquidity changes.
- The default liquidity is only an example. Check the current pool on DexScreener.
Learn how to protect yourself in slippage and priority fees. Educational only, not financial advice.
The formulas, checked
Let Q be the quote side of the pool, which is L/2. For a trade of size S, define s = S / Q. These identities follow from the rule that the two reserves multiply to a constant (the x times y equals k rule in Uniswap's documentation):
| Quantity | Buy of size S | Sell of tokens worth S at the starting price |
|---|---|---|
| Price after the trade | Start price times (1 + s) squared | Start price divided by (1 + s) squared |
| Average price you get | Start price times (1 + s) | Start price divided by (1 + s) |
| Cash received on a sell | not applicable | S divided by (1 + s) |
Worked examples for a $35,000 pool
With L = 35,000, Q = 17,500.
| Trade | s | Price after | Average price vs start |
|---|---|---|---|
| Buy $100 | 0.57% | up about 1.15% | about 0.57% worse |
| Buy $1,750 (10% of Q) | 10% | up 21% | 10% worse |
| Buy $8,750 (50% of Q) | 50% | up 125% | 50% worse |
| Sell $100 worth | 0.57% | down about 1.13% | proceeds about $99.43 |
| Sell $1,750 worth | 10% | down about 17.4% | proceeds about $1,590.91 |
Two things to notice. First, impact is roughly twice the trade-to-pool ratio for small trades, because squaring (1 + s) gives about 1 + 2s. Second, buying and selling are not symmetric in percentage terms: a +21 percent move needs only a 17.4 percent fall to reverse it, which is the same asymmetry explained in the gain and loss calculator. If a fee is charged on the input, subtract it from S first. For example, a 0.25 percent fee on a $100 buy means about $99.75 reaches the pool.
Limits of the model
- It assumes a plain constant product pool. Concentrated liquidity and other designs give different curves.
- It treats the pool as untouched except by your trade. In reality, bots and other traders move it before your transaction lands, which is one reason slippage settings exist. See Slippage and Priority Fees on Solana Explained.
- The default $35,000 is an example, not a live figure. Look up the real pool on DexScreener.
- Network fees and priority fees are not included. See Solana Fees and Rent Explained.
Common misreadings
- Confusing price impact with slippage tolerance. Impact is your own cost; tolerance is how much extra movement you permit.
- Reading a small impact percentage and forgetting that large pools can still be thin relative to a sale by a big holder. See Holder Concentration and Whale Risk.
- Assuming the sell side is the mirror of the buy side. Sells hurt more, and in a thin pool exiting a large position may not be possible at the chart price.
This tool is education, not financial advice, and does not predict any price. The QNT memecoin is independent of Quantinuum Ltd.
Sources and further reading
Facts checked 2026-10-09 against the linked pages. Education only, not financial advice. Nothing here predicts the price of any asset, and the QNT memecoin is an independent community token with no link to Quantinuum Ltd or any lab, chain or exchange named on this page.
Frequently asked questions
What is price impact?
The change in a token's price caused by your own trade, which grows with trade size relative to pool liquidity.
Is this exact for QNT?
No. It is a simplified model for learning. Real pools and fees can differ.
Why is the average price worse than the spot price?
Because each part of a trade moves the price a little, so later parts of the trade fill at worse prices.
How much does a $100 buy move a $35,000 pool?
Under the constant product model, about 1.15 percent on the price, with an average fill about 0.57 percent worse than the starting price.
Why is a sell worse than a buy of the same size?
A sell removes quote asset from the pool, and your proceeds are the trade value divided by (1 + s), so you get less than the starting price implies.
Does a larger pool reduce price impact?
Yes. Impact depends on trade size relative to the pool, so a pool ten times deeper cuts the impact of the same trade to about a tenth for small trades.
Is the fee box a good model of real fees?
It is a simplification. Real pools differ in how fees are charged and who earns them.
Keep reading
- Liquidity Depth and Price Impact Explained: Why Trade Size Moves Price
Learn how liquidity depth and price impact work in a pool, why larger trades move price more, and what the constant product idea means for memecoin traders. - Slippage and Priority Fees on Solana Explained
Slippage is the gap between the price you expect and the price you get. Priority fees pay for faster processing. Learn how to set both when swapping on Solana. - What Is a Liquidity Pool in Crypto?
A liquidity pool is a shared pot of two tokens that lets people swap on a DEX without an order book. Learn how pools set prices and why they matter for safety. - Where QUANTUM (QNT) Trades: Liquidity and Pool Checks
Where QUANTUM (QNT) trades, why liquidity and slippage matter, how to check the pool and how to avoid fake pools and copycat tokens. No price talk.
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